fix: change python stmt null value test for 2.6 (#13426)

src/connector/python/README.md

@@ -154,7 +154,7 @@ stmt = conn.statement("insert into log values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
 params = new_bind_params(16)
 params[0].timestamp(1626861392589)
 params[1].bool(True)
-params[2].null()
+params[2].tinyint(None)
 params[3].tinyint(2)
 params[4].smallint(3)
 params[5].int(4)
@@ -171,7 +171,7 @@ params[15].timestamp(1626861392589)
 stmt.bind_param(params)
 
 params[0].timestamp(1626861392590)
-params[15].null()
+params[15].timestamp(None)
 stmt.bind_param(params)
 stmt.execute()
 

tests/system-test/1-insert/stmt_error.py

@@ -54,7 +54,7 @@ class TDTestCase:
             params = new_bind_params(16)
             params[0].timestamp(1626861392589, PrecisionEnum.Milliseconds)
             params[1].bool(True)
-            params[2].null()
+            params[2].tinyint(None)
             params[3].tinyint(2)
             params[4].smallint(3)
             params[5].int(4)
@@ -120,7 +120,7 @@ class TDTestCase:
             params = new_bind_params(16)
             params[0].timestamp(1626861392589, PrecisionEnum.Milliseconds)
             params[1].bool(True)
-            params[2].null()
+            params[2].tinyint(None)
             params[3].tinyint(2)
             params[4].smallint(3)
             params[5].int(4)